function getTimestamp(dt) {
　　const now = dt || new Date(),
　　y = now.getFullYear(),
　　m = now.getMonth() + 1,
　　d = now.getDate();
　　return y + "-" + (m < 10 ? "0" + m : m) + "-" + (d < 10 ? "0" + d : d) + " " + now.toTimeString().substr(0, 8);
 }

 export {
    getTimestamp
 }